Article
Chemistry, Multidisciplinary
Li Xin Hou, Huaqiang Ju, Xing Peng Hao, Haoke Zhang, Lei Zhang, Zhiyuan He, Jianjun Wang, Qiang Zheng, Zi Liang Wu
Summary: This study presents a glassy hydrogel with intrinsic anti-freezing capacity and excellent optical and mechanical properties at ultra-low temperatures. The hydrogel has a moderate water content and dense hydrogen-bond associations, and becomes stronger and stiffer, yet still ductile, as the temperature decreases. It retains high transparency even in liquid nitrogen and exhibits unique phosphorescence at subzero temperatures.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yue Ren, Tingyi Yan, Zhuobin Huang, Qing Zhou, Ke Hua, Xiaolin Li, Yin Du, Qian Jia, Long Zhang, Haifeng Zhang, Haifeng Wang
Summary: This study demonstrates an improvement in wear resistance for a Ti-based bulk metallic glass composite at cryogenic temperatures. The wear resistance improvement is associated with the suppressed martensitic transformation and increased strength, making the material an excellent candidate for cryogenic wear applications.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Yuhua Xiong, Huating Wu, Xiaopeng Liu
Summary: This paper reports the preparation of a new type of Ti-Co-Ce getter and its hydrogen absorption performance. The results show that this getter has higher hydrogen absorption speed and capacity compared to other getters prepared under the same conditions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Polymer Science
Babak Nouri, Chun-Yu Chen, Yu-Shan Huang, Bradley W. Mansel, Hsin-Lung Chen
Summary: The study demonstrates that in block copolymers, particles with relatively high size dispersity can drive the micelles to pack into a specific C14 phase, thereby relieving the packing frustration of the Voronoi cells and the intermicellar repulsion due to the volume asymmetry and small surface area of the cells, respectively.
Article
Optics
Giovanni Martone, Tom Bienaime, Nicolas Cherroret
Summary: The study investigates the coupling phenomenon between the motional and the polarization degrees of freedom in nonparaxial polarized light beams propagating in a bulk nonlinear Kerr medium, realizing a spin-orbit-coupled mixture of fluids of light. An anisotropic Bogoliubov spectrum with both low-frequency gapless branches and high-frequency gapped ones is discovered. Experimental protocols are proposed to study the excitation mechanisms of these modes, highlighting a phenomenon of hybridization between density and spin modes unique to spin-orbit coupling.
Article
Materials Science, Multidisciplinary
E. Carre, L. Sponza, A. Lusson, I Stenger, E. Gaufres, A. Loiseau, J. Barjon
Summary: This study investigates the infrared photoluminescence of black phosphorus single crystals at very low temperatures, identifying dominant excitonic transitions at 0.276 eV and a weaker one at 0.278 eV. The free-exciton binding energy is calculated to be 9.1 meV. Analysis shows that the PL intensity quenching of the 0.276 eV peak at high temperature is attributed to the localization of free excitons on a shallow impurity. Ultimately, the value of bulk black phosphorus bandgap is refined to 0.287 eV at 2 K.
Article
Chemistry, Multidisciplinary
Gengchen Yu, Qi Zhang, Jiayi Jing, Xu Wang, Yifan Li, Xue Bai, Tao Li
Summary: By using a simple solvothermal method followed by calcination treatment, Cu+ doping in porous TiNb2O7 microspheres is successfully achieved. The introduction of Cu+ improves the electronic conductivity and lithium-ion diffusion in TiNb2O7 due to the reduced band gap and increased interplanar spacing. The Cu0.06Ti0.94Nb2O7 sample exhibits high reversible capacity, superior rate capability, and long-term cycling stability at both ambient and low temperatures, demonstrating its great potential in energy-storage applications.
Article
Chemistry, Multidisciplinary
JianHua Xu, JiaoYang Chen, YaNa Zhang, Tong Liu, JiaJun Fu
Summary: The newly designed glassy polyurethane has a high glass transition temperature, robust stiffness, and remarkable self-healing ability due to the high density of loosely packed hydrogen bonds with reversible dissociation and association capabilities below room temperature.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Nanoscience & Nanotechnology
Alireza Jalali, Mehdi Malekan, Eun Soo Park, Reza Rashidi, Ahmad Bahmani, Geun Hee Yoo
Summary: The compressive deformation behavior of Zr33Hf8Ti6Cu32Ni10Co5Al6 and Cu47Zr47Al6 alloys was studied at room temperature and high temperatures. The development of HEBMG improved ductility and fracture stress at room temperature. At high temperatures, HEBMG could withstand more stresses and had higher viscosity compared to BMG.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Na Yang, Chengcheng Fu, Fanqi Bu, Xuequan Xu, Huchen Yao, Yonghong Cheng, Jinying Zhang
Summary: The study investigated the reaction behaviors of ethylene glycol with LiAlH4, revealing that the hindrance of reaction by alcoholysis products generated from ethylene glycol, which easily react with water to yield Li-Al layered double hydroxides and facilitate low temperature hydrogen release while only consuming water from antifreeze agents.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Mathematics, Applied
Konstantin L. Metlov
Summary: This paper theoretically studies localized magnetic topological solitons with a Hopf index of 1 in an unbounded bulk magnet, starting with the classical micromagnetic Hamiltonian. It is analytically proven that there are two equivalent topologically stable configurations for these nanoobjects, similar to Bloch and Neel walls in classical magnetism. The stability regions of these solitons are plotted on a phase diagram, showing their distribution in the magnetic field - uniaxial anisotropy space. Both types of hopfions can be stable for certain parameter values.
PHYSICA D-NONLINEAR PHENOMENA
(2023)
Article
Polymer Science
Houkuan Tian, Chaofan Bi, Zhiqiang Li, Chen Wang, Biao Zuo
Summary: Polymer adsorption involves various metastable states due to kinetic constraints from solid interfaces, resulting in an interfacial adsorption layer composed of flattened trains, loosely adsorbed loops, and tails of chains. This study demonstrates that the metastable structures of the adsorption layers developed via thermal annealing above the glass-transition temperature T(g) determine the length scale of interfacial mobility gradient dynamics (xi(dyn)). It is found that 1) the evolution of xi(dyn) follows the trend in the slow kinetics of polymer absorption, and 2) xi(dyn) increases linearly with the thickness of the overall interfacial adsorption layer. These findings highlight the relevance of interfacial dynamical gradients to polymer adsorption and suggest that extension of the loosely adsorbed chains into the film interior could enhance the propagation of suppressed dynamics originating at the interface.
Article
Chemistry, Physical
J. R. Tena-Garcia, M. Osorio-Garcia, K. Suarez-Alcantara
Summary: Mixtures of LiBH4/VCl3 and LiAlH4/VCl3 with different stoichiometries were prepared and tested for hydrogen release. The mixtures showed diverse hydrogen release levels and exhibited a change in reaction pathway at low temperatures.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
D. D. Papadias, R. K. Ahluwalia
Summary: Techno-economic analysis shows that underground storage of hydrogen in pipes is more economical for small-scale storage below 20 tonnes, while salt caverns become more cost-effective as storage capacity increases. Large-scale hydrogen storage requires consideration of multiple caverns.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Yuji Momotani, Akinobu Shibata, Nobuhiro Tsuji
Summary: The present study investigated hydrogen-related fractures in low-carbon martensitic steel at different deformation temperatures. The sensitivity to hydrogen embrittlement increased with decreasing temperature from 100 degrees C to 0 degrees C, but decreased further below 0 degrees C. The characterization of fracture surface types revealed a similar temperature dependence of hydrogen-embrittled surfaces to the sensitivity to hydrogen embrittlement. Qualitative discussion indicated that the degree of hydrogen accumulation peaked in the medium temperature range, consistent with the experimentally confirmed sensitivity to hydrogen embrittlement.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Physics, Multidisciplinary
G. Guijarro, G. E. Astrakharchik, J. Boronat
Summary: This study demonstrates the formation of ultradilute quantum liquids with ultracold bosonic dipolar atoms in a bilayer geometry. The proposed system uses dipolar interactions alone to create a self-bound state without the need for an additional short-range potential. Quantum Monte Carlo simulations reveal a diverse ground-state phase diagram with quantum phase transitions between liquid, solid, atomic gas, and molecular gas phases. The stabilization mechanism of the liquid phase involves an effective balance between dimer-dimer attraction and three-dimer repulsion, with the equilibrium density controlled by the interlayer distance.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Gerard Pascual, Jordi Boronat
Summary: The Bose polaron system shows different behavior and properties at different temperatures, with a loss of quasiparticle nature close to the critical temperature. Additionally, the impurity hinders the condensation of bosons in the condensate.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Condensed Matter
Sergi Pradas, Jordi Boronat
Summary: The miscibility of two dipolar quantum gases at zero temperature was studied using the diffusion Monte Carlo method. The results show that the mixing between the two species is constrained by the relative dipolar moments and masses.
Article
Education, Scientific Disciplines
Jordi Pera, Jordi Boronat
Summary: The s-wave and p-wave scattering lengths and the s-wave effective range are the most important parameters in the study of low-energy scattering. By solving the scattering problem and deriving two useful formulas, we are able to calculate these parameters for any angular momentum, as long as the Wigner threshold law holds. We also analyze the behavior of the scattering parameters near Feshbach resonances and provide practical activities for learning scattering theory.
AMERICAN JOURNAL OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
Giulia De Rosi, Riccardo Rota, Grigori E. Astrakharchik, Jordi Boronat
Summary: In this study, the effect of thermal fluctuations on correlations in a one-dimensional Bose gas with repulsive interactions is comprehensively investigated. The pair correlation function, static structure factor, and one-body density matrix are calculated using the exact ab-initio Path Integral Monte Carlo method for various interaction strengths and temperatures. A detailed comparison with different theoretical models is provided. The Monte Carlo results agree excellently with the tractable limits and serve as an important benchmark for future experiments in different platforms.
NEW JOURNAL OF PHYSICS
(2023)
Article
Multidisciplinary Sciences
Cong Liu, Ion Errea, Chi Ding, Chris Pickard, Lewis J. J. Conway, Bartomeu Monserrat, Yue-Wen Fang, Qing Lu, Jian Sun, Jordi Boronat, Claudio Cazorla
Summary: It is predicted that solid helium becomes a metal at high pressures and transitions into an excitonic insulator and a superconductor. The study reveals that helium becomes an excitonic insulator before metallization and a superconductor after metallization. These phenomena could be crucial for improving our understanding and modeling of celestial bodies.
NATURE COMMUNICATIONS
(2023)
Article
Optics
Kilian Seibold, Riccardo Rota, Fabrizio Minganti, Vincenzo Savona
Summary: In this study, we develop a quantum-mechanical model of dissipative Kerr solitons in ring microresonators and investigate the model using the truncated Wigner method. We find that the soliton experiences a finite coherence time due to quantum fluctuations originating from losses. Interpreting the results in terms of the theory of open quantum systems allows us to estimate the Liouvillian spectrum of the system, which is characterized by a set of eigenvalues with finite imaginary parts and vanishing real parts in the limit of vanishing quantum fluctuations. This feature indicates that dissipative Kerr solitons are a specific class of dissipative time crystals.
Article
Materials Science, Multidisciplinary
M. C. Gordillo, J. Boronat
Summary: The phase diagram of the second layer of para-H-2 adsorbed on graphite was calculated using quantum Monte Carlo methods. The study revealed that this nearly two-dimensional crystal exhibits a finite superfluid density at a certain total density, which can be experimentally observed.
Article
Physics, Multidisciplinary
V Cikojevic, L. Vranjes Markic, M. Pi, M. Barranco, F. Ancilotto, J. Boronat
Summary: This study investigates the dynamical equilibration and binary head-on collisions of quantum droplets made of a K-39 - K-39 Bose mixture using time-dependent density-functional theory. Important effects of initial population ratio deviation from the optimal mean-field value are extensively explored. The study shows sensitivity to an initial nonoptimal concentration and proposes a two-component approach for addressing situations with three-body losses mainly acting on one of the mixture's components.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Optics
V Cikojevic, E. Poli, F. Ancilotto, L. Vranjes Markic, J. Boronat
Summary: The study focuses on a quantum liquid in a heterogeneous mixture of K-41 and Rb-87 atoms, using diffusion Monte Carlo and density-functional theory to investigate its properties and characteristics. It verifies the perturbative Lee-Huang-Yang term for a heterogeneous mixture and presents extensions to Lee-Huang-Yang corrected mean-field energy functionals based on bulk mixture equations of state calculated with diffusion Monte Carlo. Systematic comparison between different functionals is carried out using density-functional theory, with a focus on critical atom number, surface tension, surface width, Tolman length, and compressibility within the stability domain of the liquid mixture.
Article
Optics
Raul Bombin, Viktor Cikojevic, Juan Sanchez-Baena, Jordi Boronat
Summary: This study focuses on the repulsive Fermi polaron in a two-component, two-dimensional system of fermionic atoms, investigating properties such as polaron energy, quasiparticle residue, and effective mass using the diffusion Monte Carlo method. The results highlight the importance of considering the effective range and scattering length to reproduce experimental results, as well as the establishment of universality through different model potentials for the interaction between the Fermi sea and the impurity. This underscores the significance of quantum fluctuations and beyond mean-field effects in accurately describing the Fermi polaron problem.
Article
Materials Science, Multidisciplinary
Yu E. Lozovik, I. L. Kurbakov, G. E. Astrakharchik, J. Boronat
Summary: The proposed method provides an accurate estimation of the condensate fraction in strongly correlated systems under various conditions, with experimental measurements confirming its effectiveness.
Article
Optics
Omar Abel Rodriguez-Lopez, M. A. Solis, J. Boronat
Summary: We study the structural superfluid-Mott-insulator quantum phase transition of an interacting one-dimensional Bose gas within multirod lattices, and use the ab initio diffusion Monte Carlo method to calculate relevant parameters. We find that varying the width of barriers from zero to the length of the potential period can induce the SF-MI phase transition.
Article
Optics
Kilian Seibold, Riccardo Rota, Vincenzo Savona